1030 hours - In position 10°54'30"N, 99°31'E fired one torpedo from 1600 yards. The torpedo broached and took a slight jog to the right and then ran straight throwing a plume of water. It was noticed that it was going to miss so at .....

1031 hour - Fired a second torpedo. This torpedo also broached but turned left before it ran straight. Looked like this was also going to miss.

1032 hours - The first torpedo exploded on the beach.

1033 hours - Fired a third torpedo. Six seconds after firing this torpedo the second torpedo fired did hit the target after all hitting him in the stern demolishing that section of the ship.

1034 hours - The third torpedo hit the target in the middle. A large fire now erupted. The target was a total loss.

1045 hours - Secured from battle stations.

20 Jul 1945During 19/20 July 1945, USS Bumper (Cdr. J.W. Williams, Jr., USN), made four torpedo attacks on a Japanese convoy. In the first three attacks the Japanese destroyer Kamikaze was attacked with a total of 13 torpedoes which all missed. In the fourth attack Bumper torpedoed and sank the Japanese tanker Kyoei Maru No.3 (1189 GRT, built 1941) in the Gulf of Siam in position 08°08'N, 103°40'E.

(All times are zone I, -9)
19 July 1945
1610 hours - Sighted three Japanese floatplanes. They were circling, most likely they were cover for a convoy. Turned towards them.

1722 hours - Sighted the masts of a destroyer. Battle stations torpedo. The contact developed into a convoy made up of two small tankers and a very small freighter escorted by several patrol craft. The destroyer was of the Kamikaze class. Commenced an attack on the destroyer. Position was 06°55'N, 103°40'E.

1815 hours - In position 06°50'N, 103°35'E fired three bow torpedoes at the destroyer. Then went deep to 160 feet.

1820 hours - The first of six single depth charges was dropped. None were very close.

1930 hours - Returned to periscope depth. Sighted the destroyer at a range of 7500 yards.

2044 hours - Surfaced in a heavy rain storm. No radar contact. Went ahead full on two engines, charging on the other two hading up the convoy's base course. We want that destroyer on the bottom of the sea.

2120 hours - Went ahead full on three engines, now charging on one engine.

0346 hours - In position 07°58'N, 103°40'E fired the last four bow torpedoes at the nearest target. Range was 1800 yards. All missed. Opened out to the north-west.

0355 hours - Started another attack.

0437 hours - In firing position but range was 3000 yards. Decided to start another attack run and get in closer. Opened out on the convoy's port quarter and then went in again.

0529 hours - In position 08°08'N, 103°40'E fired the last three torpedoes on board from the stern tubes at a tanker. Torpedo run was 2200 yards.

0531 hours - Observed and heard a timed hit on the target. Then opened out to 7500 yards. The target was stopped on the radar scope.

0605 hours - The target was still on the radar scope. Closed to sink it with gunfire if needed. When closing the radar pip was seen to come from the target's bow section that was sticking high in the air. The remainder of the ship was below the water.

0630 hours - All ahead full and made off for deeper water. In the evening course was set for Subic Bay to reload torpedoes.

(All times are zone I, -9)
0930 hours - Sighted a small tug with a barge in tow moving along the coast in position 01°31'S, 105°34'E. On seeing us he slipped his tow and headed for the beach.

1000 hours - Opened fire on the barge with 40mm from a range of 2500 yards and closing. Then opened fire with the 5". The first shot was a hit and the barge sank. Now turned the 5" on the tug. Three hits out of eighteen rounds sank him. Ammunition expended; 19 rounds of 5" and 144 rounds of 40mm.